Liya Fan created ARROW-13147:
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Summary: [Java] Respect the rounding policy when allocating vector
buffers
Key: ARROW-13147
URL: https://issues.apache.org/jira/browse/ARROW-13147
Project: Apache Arrow
Issue Type: Improvement
Components: Java
Reporter: Liya Fan
Assignee: Liya Fan
According to the current implementation, the default "next power of two"
rounding policy is assumed when allocating buffers for a vector.
In particular, for fixed width vectors, this policy is applied for the validity
and data buffers, and for variable width vectors, this policy is applied for
the validity and offset buffers.
However, this default policy is not always used for the allocator. When an
alternative policy is in use, the buffers allocated assuming the default policy
will have inappropriate capacities, which may lead to waste of memory spaces.
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